[BUG] function_schema_parser does not support type aliases

app.py:

@dataclass
class ExternalImageSearchRequest:
    image_ids: list[str]


@dataclass
class ExternalImageSearchResponse:
    result: Optional[external.ImageSearchResponse]
    error: Optional[str]


@function
def external_image_search(_, event: ExternalImageSearchRequest) -> ExternalImageSearchResponse:
    try:
        result, error = external.image_search(config, session, event.image_ids)
        if error is not None:
            return ExternalImageSearchResponse(None, dumps(error))
        return ExternalImageSearchResponse(result, None)
    except Exception as e:
        return ExternalImageSearchResponse(None, dumps(e))

external.py

class ImageSearchResponseValue(TypedDict):
    key_1: str
    key_2: str
    key_3: str
    key_4: str


ImageSearchResponse = dict[str, list[ImageSearchResponseValue]]

trace:

Traceback (most recent call last):
    @function
  File "/app/client/queries/app.py", line 65, in <module>
     ^^^^^^^^
  File "/app/client/run-env/lib/python3.11/site-packages/compute_modules/annotations.py", line 34, in function
    return function_wrapper(maybe_func)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/client/run-env/lib/python3.11/site-packages/compute_modules/annotations.py", line 30, in function_wrapper
    add_function(func, streaming=streaming, edits=edits)
  File "/app/client/run-env/lib/python3.11/site-packages/compute_modules/function_registry/function_registry.py", line 41, in add_function
    parse_result = parse_function_schema(
                   ^^^^^^^^^^^^^^^^^^^^^^
  File "/app/client/run-env/lib/python3.11/site-packages/compute_modules/function_registry/function_schema_parser.py", line 56, in parse_function_schema
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    output = _extract_output(type_hints)
  File "/app/client/run-env/lib/python3.11/site-packages/compute_modules/function_registry/function_schema_parser.py", line 151, in _extract_output
    output_data_type, _ = _extract_data_type(type_hints[RETURN_KEY])
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/client/run-env/lib/python3.11/site-packages/compute_modules/function_registry/function_schema_parser.py", line 300, in _extract_data_type
    custom_type_fields[field_name], child_class_node = _extract_data_type(field_type_hint)
                                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/client/run-env/lib/python3.11/site-packages/compute_modules/function_registry/function_schema_parser.py", line 296, in _extract_data_type
  File "/app/client/run-env/lib/python3.11/site-packages/compute_modules/function_registry/function_schema_parser.py", line 320, in _assert_is_valid_custom_type
    _assert_is_valid_custom_type(type_hint)
    if issubclass(item, dict):
       ^^^^^^^^^^^^^^^^^^^^^^
TypeError: issubclass() arg 1 must be a class

Start in compute_modules/function_registry/function_schema_parser.py, especially _extract_data_type and _assert_is_valid_custom_type, then reproduce the traceback with the dataclass and type alias shown in the issue. Done means function_schema_parser accepts the aliased ImageSearchResponse annotation without raising TypeError and produces the expected function schema.